linux-ext4 - Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

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Date:	Tue, 10 May 2011 13:33:11 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Mel Gorman <mgorman@...ell.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	Mel Gorman <mgorman@...e.de>, Jan Kara <jack@...e.cz>,
	colin.king@...onical.com, Chris Mason <chris.mason@...cle.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

On Tue, May 10, 2011 at 1:21 PM, Mel Gorman <mgorman@...ell.com> wrote:
> It goes on. A number of filesystem and network paths are being hit
> with high-order allocs. i915 was a red herring, it's present but not
> in massive numbers. The filesystem, network and mempool allocations
> are likely to be kicking kswapd awake frequently and hurting overall
> system performance as a result.
>
> I really would like to hear if the fix makes a big difference or
> if we need to consider forcing SLUB high-order allocations bailing
> at the first sign of trouble (e.g. by masking out __GFP_WAIT in
> allocate_slab). Even with the fix applied, kswapd might be waking up
> less but processes will still be getting stalled in direct compaction
> and direct reclaim so it would still be jittery.

Yes, sounds reasonable to me.

                         Pekka
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